Exactly. If you have them in just now and run them into the ground for a couple of weeks, you're going to need to do it again 6 weeks down the line before the season starts in October so the players are in peak condition for the kick off. I don't think players would be happy with essentially doing two preseasons.
If you're not running them hard just now, what's the point? Doing wee ball work drills etc is just going through the motions and players will get bored quickly when they have no games to look forward to.
Just let the players look after their own fitness just now and get them in 6-7 weeks before the season starts for a proper preseason.